<!-- Licensed under a BSD license. See license.html for license -->
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
    <title>Three.js - Scenegraph - Car</title>
    <style>
    html, body {
        height: 100%;
        margin: 0;
    }
    #c {
        width: 100%;
        height: 100%;
        display: block;
    }
    </style>
  </head>
  <body>
    <canvas id="c"></canvas>
  </body>
<script src="resources/threejs-lessons-helper.js"></script> <!-- you can and should delete this script. it is only used on the site to help with errors -->
<script type="importmap">
{
  "imports": {
    "three": "../../build/three.module.js"
  }
}
</script>

<script type="module">
import * as THREE from 'three';

function main() {

	const canvas = document.querySelector( '#c' );
	const renderer = new THREE.WebGLRenderer( { antialias: true, canvas } );
	renderer.setClearColor( 0xAAAAAA );

	const fov = 40;
	const aspect = 2; // the canvas default
	const near = 0.1;
	const far = 1000;
	const camera = new THREE.PerspectiveCamera( fov, aspect, near, far );
	camera.position.set( 8, 4, 10 );
	camera.lookAt( 0, 0, 0 );

	const scene = new THREE.Scene();

	{

		const light = new THREE.DirectionalLight( 0xffffff, 3 );
		light.position.set( - 1, 2, 4 );
		scene.add( light );

	}

	{

		const light = new THREE.DirectionalLight( 0xffffff, 3 );
		light.position.set( 1, - 2, - 4 );
		scene.add( light );

	}

	const carWidth = 4;
	const carHeight = 1;
	const carLength = 8;

	const bodyGeometry = new THREE.BoxGeometry( carWidth, carHeight, carLength );
	const bodyMaterial = new THREE.MeshPhongMaterial( { color: 0x6688AA } );
	const bodyMesh = new THREE.Mesh( bodyGeometry, bodyMaterial );
	scene.add( bodyMesh );

	const wheelRadius = 1;
	const wheelThickness = .5;
	const wheelSegments = 6;
	const wheelGeometry = new THREE.CylinderGeometry(
		wheelRadius, // top radius
		wheelRadius, // bottom radius
		wheelThickness, // height of cylinder
		wheelSegments );
	const wheelMaterial = new THREE.MeshPhongMaterial( { color: 0x888888 } );
	const wheelPositions = [
		[ - carWidth / 2 + wheelThickness / 2, - carHeight / 2, carLength / 3 ],
		[ carWidth / 2 + wheelThickness / 2, - carHeight / 2, carLength / 3 ],
		[ - carWidth / 2 + wheelThickness / 2, - carHeight / 2, - carLength / 3 ],
		[ carWidth / 2 + wheelThickness / 2, - carHeight / 2, - carLength / 3 ],
	];
	const wheelMeshes = wheelPositions.map( ( position ) => {

		const mesh = new THREE.Mesh( wheelGeometry, wheelMaterial );
		mesh.position.set( ...position );
		mesh.rotation.z = Math.PI * .5;
		scene.add( mesh );
		return mesh;

	} );

	function resizeRendererToDisplaySize( renderer ) {

		const canvas = renderer.domElement;
		const width = canvas.clientWidth;
		const height = canvas.clientHeight;
		const needResize = canvas.width !== width || canvas.height !== height;
		if ( needResize ) {

			renderer.setSize( width, height, false );

		}

		return needResize;

	}

	// const carPosition = [0, 0, 0];

	function render( time ) {

		time *= 0.001;

		if ( resizeRendererToDisplaySize( renderer ) ) {

			const canvas = renderer.domElement;
			camera.aspect = canvas.clientWidth / canvas.clientHeight;
			camera.updateProjectionMatrix();

		}

		wheelMeshes.forEach( ( obj ) => {

			obj.rotation.x = time;

		} );

		renderer.render( scene, camera );

		requestAnimationFrame( render );

	}

	requestAnimationFrame( render );

}

main();
</script>
</html>
